---
title: "Mastering Core Web Vitals: The 2025 Performance Optimization Guide"
description: "Comprehensive guide to optimizing Core Web Vitals (LCP, INP, CLS) for better performance and SEO in 2025."
canonical: https://itsupportintokyo.com/en/blog/web-performance-core-web-vitals
language: en-US
published: 2026-02-04T15:29:13.428Z
modified: 2026-04-28T07:38:15.788Z
author: "IT Support Tokyo"
keywords: "Core Web Vitals, LCP, INP, CLS, web performance, SEO, page speed"
image: https://izdteczidppwfupoddun.supabase.co/storage/v1/object/public/blog-images/blog-core-web-vitals.jpg
translation: https://itsupportintokyo.com/ja/blog/web-performance-core-web-vitals
---

# Mastering Core Web Vitals: The 2025 Performance Optimization Guide

> Comprehensive guide to optimizing Core Web Vitals (LCP, INP, CLS) for better performance and SEO in 2025.

## Core Web Vitals in 2025

Google's Core Web Vitals remain crucial ranking factors. In 2024, INP (Interaction to Next Paint) replaced FID as a core metric, emphasizing sustained interactivity over first input.

### The Three Pillars

- **LCP (Largest Contentful Paint)**: Target

### LCP Optimization

- Optimize and compress images (WebP, AVIF)
- Implement priority hints for critical resources
- Use CDN for static assets
- Preload critical fonts and images
- Server-side render above-the-fold content

### INP Optimization

- Break up long tasks (yield to main thread)
- Use web workers for heavy computation
- Optimize event handlers
- Implement virtualization for long lists

### CLS Optimization

- Always specify image dimensions
- Reserve space for dynamic content
- Avoid inserting content above existing content
- Use CSS transform for animations

### Measurement Tools

Use Lighthouse, PageSpeed Insights, and Chrome DevTools for continuous monitoring.

## Source

Canonical HTML: https://itsupportintokyo.com/en/blog/web-performance-core-web-vitals
Other language: https://itsupportintokyo.com/ja/blog/web-performance-core-web-vitals